A triangular pyramid is a pyramid that has a triangular base. In total it consists of four faces, all of which are triangles. While all the side triangles must be of the same size, the base may or may be the same size as the sides.
A triangular pyramid has four faces, four corners (or vertices) and six edges in total. It falls under the designation of a tetrahedron because it has four triangular faces. If all the triangles are identical equilateral triangles, then it is a regular tetrahedron. To calculate the volume of a triangular pyramid, a person would multiply the base area by the height of the pyramid and then divide by 3.